Comparative analysis between mineral composites produced with wood particles passing on the size 1,2 mm

Abstract

ABSTRACT: Wood composites appear as an alternative for the reuse of construction and demolition waste (CDW) of wood. Portland cement has been used as a binder conferring strength and durability, however the combination of these materials may result in handle inhibition. In contrast, few studies have been carried out with wood composites using gypsum as a binder. In this paper the influence of two binders (Portland cement and gypsum) was evaluated in relation to the physical and mechanical properties of composites produced from wood particles (plywood, eucalyptus and pine) from construction and demolition waste (CDW) passing on the size  1.2 mm. The wood residues were ground, treated, sieved and characterized by unit mass and moisture content. The CPV-ARI cement was used, the slow gypsum plaster, the handle accelerator additive. The tests of hardened specific gravity, flexural and the compressive strength in the hardened stage at 28 days. The results indicated that the higher the amount of wood particles in the composition, the lower hardened specific gravity and the compressive strength of the composite. All composites produced with cement-wood presented a hardened specific gravity lower than that stipulated by NBR 15498. The hardened specific gravity of the gypsum-wood composites, in the content of 15% of particles, approached the values indicated by NBR 14715.